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Table 1 Number of emergency department visits for asthma, by age-group, sex, and season

From: Outdoor air pollution and emergency department visits for asthma among children and adults: A case-crossover study in northern Alberta, Canada

Characteristic Number of visits %
Age (in years)   
   2 – 4 7,247 12.5
   5 – 14 13,145 22.7
   15 – 24 11,616 20.1
   25 – 44 13,300 23.0
   45 – 64 7,899 13.6
   65 – 74 2,850 4.9
   ≥ 75 1,855 3.2
Sex   
   Male 27,926 48.2
   Female 29,986 51.8
Season   
   Spring/Summer (April to September) 30,576 52.8
   Fall/Winter (October to March) 27,336 47.2
Total visits 57,912 100.0